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MG ZT problems (2001–2005)

All 2 engines of the MG ZT that we have documented have high or critical severity faults: the Rover K-Series and the BMW M47. None has a «Buy» verdict; the safest option is the BMW M47, with a «With caution» verdict.[1][2]

Outside the engine: Parkers praises the MG ZT's driving; beyond the engine, the UK MOT data only flags corroded brake pipes and a weak handbrake.[3][4]

MG ZT (2001–2005)
Photo: Calreyn88 · CC BY-SA 4.0 · Wikimedia Commons. Reference image for this generation.
02468107.0out of 10

MG ZT rating: acceptable reliability

Calculated using only 6 documented faults and their sources: the most serious and frequent faults weigh more. Limited evidence: it is based on few sources or few documented faults, so it is not included in the rankings. Having few documented faults does not mean it is reliable: it may simply be little studied. How it is calculated

  • Engine7.0From 5.4 to 8.6 depending on the engine
  • Gearbox10.0No documented faults
  • Suspension10.0No documented faults
  • Brakes7.12 faults
  • Tyres and wheels10.0No documented faults
  • Steering10.0No documented faults
  • Electrical system10.0No documented faults
  • Headlights and lights10.0No documented faults
  • Electronics and infotainment10.0No documented faults
  • Climate control10.0No documented faults
  • Bodywork and interior10.0No documented faults
  • Airbags and safety10.0No documented faults

The weak points of the MG ZT

  1. 1High severity: Head gasket failureRover K-Series engine
  2. 2High severity: Sunken cylinder liners and warped head after overheatingRover K-Series engine
  3. 3High severity: Corroded brake pipesBrakes
  4. 4Critical severity: Oil leak from the brake vacuum pumpBMW M47 engine
  5. 5Medium severity: Coolant leaks: expansion tank cap, rear block rail and hosesRover K-Series engine

Documented engines, from highest to lowest risk

The first label is the most serious fault affecting that engine in this car; the second, our verdict for the versions it is fitted to. Each engine's risk index is calculated only from the faults that affect this car (how we calculate it). We only show engines we have documented with sources: if yours does not appear, we have not analysed it yet. View all engines

See what to check before buying

Outside the engine

12 sourcesHow we work

Rover K-Series

Rover / MG K-Series (1.1, 1.4, 1.6 and 1.8 16V, incluido el 1.8 VVC) · Petrol

In the ZT
2001–2005[2][5]
Names
ZT 1.8 · ZT 160
Faults that affect it
3 · 2 of high or critical severity
Risk index on this car
46
Moderate risk

Verdict for the versions it uses

  • 1.8 16V 117-136 hp (18K4F, 1995-2005)1995–2005 · 117–136 hp · 18K4F

    With caution

    This is the version most cited in head gasket failures; it is worth buying if it already has the multi-layer (MLS) gasket with the liners measured, and Diariomotor considers its absence a good argument for negotiating the price.[6][7][8]

  • 1.8 T turbo 150-160 hp (18K4T, 2002-2005)2002–2005 · 150–160 hp · 18K4T

    With caution

    We have not found reliability data specific to the turbo; it inherits the K-Series' cooling circuit and gasket reputation, so it is worth demanding the coolant history.[6][9]

Faults that affect the ZT

  1. High severityFrequency: CommonCylinder head and blockHead gasket failureThe K-Series' big problem is the head gasket, which can fail even below 100,000 km because of a mix of gasket design, cooling and overheating. The usual repair uses the multi-layer steel (MLS) gasket that was developed for the Freelander.
  2. High severityFrequency: OccasionalCylinder head and blockSunken cylinder liners and warped head after overheatingAfter overheating, the K-Series liners can end up below the surface of the block and the aluminium head can be marked or warped; then no gasket seals properly and the liner height has to be measured and restored.
  3. Medium severityFrequency: OccasionalCoolingCoolant leaks: expansion tank cap, rear block rail and hosesThe K-Series circuit holds about 5.5 litres, so a slow leak empties the expansion tank and causes localised overheating. The points cited are the tank cap, the metal rail at the rear of the block (corrosion), the hoses and the coolant passages of the inlet manifold gasket.

ZT Rover K-Series pageAll versions and faults of the Rover K-Series

BMW M47

Safest option

BMW M47 (M47D20 / M47TU / M47TU2 / M47R) · Diesel

In the ZT
2001–2005[5]
Name
ZT CDTi 115/135
Faults that affect it
1 · of high or critical severity
Risk index on this car
14
Low risk

Verdict for the version it uses

  • M47R 116-131 hp (Rover 75, MG ZT and Land Rover Freelander, 1998-2006)1998–2006 · 116–131 hp · M47R

    With caution

    The M47R was designed with a different turbo and thermal management from the BMW-badged engine, so the faults documented in this entry for the D20/TU/TU2 versions cannot be directly extrapolated to it; we recommend general caution and a full mechanical inspection before buying.[1][2]

Faults that affect the ZT

Only those that affect the versions and years that this car used. The BMW M47 has 6 documented faults in total.

  1. Critical severityFrequency: RareOtherOil leak from the brake vacuum pumpA BMW specialist workshop documents that the seals of the M47's vacuum pump, which generates the vacuum needed for brake assistance because a diesel does not produce it naturally, can wear and let oil through, which can end up stiffening the brake pedal.

ZT BMW M47 pageAll versions and faults of the BMW M47

Faults of the MG ZT outside the engine

Suspension, brakes, tyres, electronics and the rest of the car. They occur with any engine.

Checklist for buying a used MG ZT

Check the advert or the paperwork to see which engine the car has and go through its section. Each point comes from a documented fault; you can tick them off as you inspect.

If it has the Rover K-Series (2001–2005)

Head gasket failure

High severity

Sunken cylinder liners and warped head after overheating

High severity

Coolant leaks: expansion tank cap, rear block rail and hoses

Medium severity

If it has the BMW M47 (2001–2005)

Oil leak from the brake vacuum pump

Critical severity

Wear parts for the MG ZT

Brakes, wiper blades, pollen filter and battery, searched for this model. The exact part number depends on the engine and year: confirm it with the registration plate or VIN.

Affiliate links: if you buy from these shops, MotorFiable may receive a commission at no cost to you. Check compatibility against the registration plate or VIN before ordering. Affiliate links

Buying a MG ZT?

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Own a MG ZT? Tell us what faults you have had, at what mileage and how much you paid. Report your fault.

Frequently asked questions

Is the MG ZT reliable?

All 2 engines of the MG ZT that we have documented have high or critical severity faults: the Rover K-Series and the BMW M47. None has a «Buy» verdict; the safest option is the BMW M47, with a «With caution» verdict. Parkers praises the MG ZT's driving; beyond the engine, the UK MOT data only flags corroded brake pipes and a weak handbrake.

Which MG ZT engine is the most reliable?

Among the 2 engines we have documented, none has a «Buy» verdict; the safest option is the BMW M47, with a «With caution» verdict. The M47R was designed with a different turbo and thermal management from the BMW-badged engine, so the faults documented in this entry for the D20/TU/TU2 versions cannot be directly extrapolated to it; we recommend general caution and a full mechanical inspection before buying.[1][2]

What problems does the MG ZT have apart from the engine?

Parkers praises the MG ZT's driving; beyond the engine, the UK MOT data only flags corroded brake pipes and a weak handbrake. The most important documented faults are: corroded brake pipes (brakes, high severity) and handbrake with insufficient holding power (brakes, medium severity).[3][4]

What faults does the MG ZT have?

The most important by severity and frequency, on the engines we have documented, are: head gasket failure (Rover K-Series, high severity), sunken cylinder liners and warped head after overheating (Rover K-Series, high severity), oil leak from the brake vacuum pump (BMW M47, critical severity) and coolant leaks: expansion tank cap, rear block rail and hoses (Rover K-Series, medium severity).

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. BMW M47Wikipedia (inglés) · Other source · consulted 27 September 2026
  2. Rover 75Wikipedia (inglés) · Other source · consulted 27 September 2026
  3. Used MG ZT Saloon (2004-2005) ReviewParkers · Motoring press · published 6 June 2019 · consulted 30 October 2026
  4. MG ZT Car Check: MOT History, Reliability & FaultsCarVerify · Reliability study · consulted 30 October 2026
  5. MG ZTWikipedia (en) · Other source · consulted 8 October 2026
  6. Guía de compra del MG TF de segunda manoDiariomotor · Motoring press · published 7 November 2023 · consulted 8 October 2026 · in Spanish
  7. Choosing the correct K Series Head Gasket KitDMGRS · Technical documentation · consulted 8 October 2026
  8. MG ZR ZS ZT & Modern Engine & FuelMGOC Spares · Technical documentation · consulted 8 October 2026
  9. Cooling and heating (K-Series: ZR, ZS, ZT, MGF, TF)MGOC Spares · Technical documentation · consulted 8 October 2026
  10. MG ZR (used car review)Auto Express · Motoring press · published 28 September 2004 · consulted 8 October 2026
  11. MGF & TF Headgasket Repair KitsMGOC Spares · Technical documentation · consulted 8 October 2026
  12. Motor BMW M47: problemas y averíasDasercars · Technical documentation · consulted 27 September 2026 · in Spanish